# Overview This chapter describes the terminology used in the document as well as the components of the Verestro system that are part of the Verestro Goals. ## Terminology
**Name** **Description**
Balance The place in the Verestro system where funds are held. Depending on your balance, withdrawals from your balance are possible or not.
Credit Antaca balance method for topping up your balance.
Debit Antaca balance method for debiting your balance.
User End user, e.g. the entity to which the card was issued.
## Application components This chapter is describing all components involved in the processes included in the Verestro Goals product. Each of the sections below describes one of the components. ### Mobile application Mobile application is [white label product](https://developer.verestro.com/books/white-label-application) that provides comprehensive functionality for the mobile end user. The available range of functionality is wide and can be freely modified according to product requirements. In the context of Verestro Goals, the application provides an interface for adding a goals and performing actions on it, such as top up, withdraw, or delete. ### Antaca [Antaca ](https://developer.verestro.com/books/card-issuing-and-core-banking/page/overview#bkmrk-user-balance)is the service responsible for balance management and card issuing. Balance management itself can be divided into three main actions: creating a balance, topping up the balance, debiting the balance. Creating a balance is an initial action consisting in registering a company/user account and then generating a place in the system where information about its current funds will be stored. Crediting balance is an action that allows you to increase the amount of funds stored on the created balance. This action is necessary to perform if funds transfer orders are to be executed from the balance. Debiting balance is an action that allows you to decrease your balance for specific amount. It should be performed at the moment when an order to send funds outside is made from the balance.
**Method** **Description**
Create balance Method that allows you to create a balance for your users.
Credit balance Method that allows you to top up the created balance.
Debit balance Method that allows you to debit the created balance.
### Savings Service Service responsible for accepting funds transfer orders in the context of the balances created in [Antaca](https://developer.verestro.com/books/card-issuing-and-core-banking/page/overview#bkmrk-user-balance). When the Savings Service receives a request for such a transfer, it communicates with the [Antaca](https://developer.verestro.com/books/card-issuing-and-core-banking/page/overview) service. Thus, it informs which balance should be debited and for what amount and where the funds taken from the balance should ultimately go, i.e. in this case, which card should be loaded with these funds. ### Transaction History Core A service that provides the history of operations on balances. [Transaction History Core](https://developer.verestro.com/books/transaction-history-api) allows you to check the history of operations performed in the context of a given balance.